メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.0500000 43.0125000, 143.0562500 43.0125000, 143.0562500 43.0166667, 143.0500000 43.0166667, 143.0500000 43.0125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral